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ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Income taxes recoverable $ 320 $ 206
Unrelated customers 197,631 187,937
Less: allowance for bad debts and credit notes (11,173) (9,598)
Total accounts receivable $ 186,458 $ 178,339